Excavator



Patented May l6,|8'99.

N0. 625MB.

P. LAMBING. EXGAVATOR.

(Application filed July 28, 1898.)

2 SheetsSheet I.

(No Model) mvsnrron WITNESSES N0. 625,ll0. Patented Ma'y l6, I899 l. P. LAMBING.

EXCAVATOB.

(Application filed July 28, 1898.. (No Model.)

2 Sheets-Sheet 2.

wrrnesses 776% mvsm'on MW aa 6 THE Nam-us PETERS co, FHDIULHHO" WASHINGTON. n. c.

UNITED STATES PATENT OFFICE.

ISAAC P. LAMBING, OF DENVER, COLORADO.

EXCAVATO R.

SPECIFICATION forming part of Letters Patent No. 625,110, dated May 16, 1899. Application filed duly 28, 1898. Serial No. 687,101. (No model.)

To all whom it may concern.- Be it known that I, ISAAC P. LAMBING, of

Denver, in the county of Arapahoe and State of Colorado, have invented a new and useful Improvement in Excavators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side elevation of my improved excavator. Fig. 2 is a vertical cross-section of the same on the line'II II of Fig. 3, showing the blades partly closed. Fig. 3 is a vertical longitudinal section. Fig. 4 is an enlarged detail view showing the piston or vane and its connection to the oscillatory disk, and Fig. 5 is a disagrammatic View showing the blades in partly-closed position.

My invention relates to the class of excavators, and more especially to those employed forsurface orplacerminin g; anditis designed to largely do away with the breaking of the blades which frequently occurs in the clamshell type, to greatly decrease the friction and drag upon the blades or scoops, and to provide an excavator which is simple and may be cheaply made and operated.

In the drawings, 2 represents the framework of the excavator,which consists of a baseplate having triangular end supports or hangers provided with bearings 3 3 for the transverse shaft at. The device is suspended by chains or cables secured to the upper ends of the hangers and depending from the boom of a derrick or in any other desirable manner. Secured to the center of the shaft 4 is a disk 5, having a projection or lug 6 at one side, which is preferably of cross shape, as shown in Fig. 5. This lug enters a corresponding slot in an oscillatory piston 7, which moves within a chamber 8, formed between the two concentric cylinders 9 and 10. The space between these cylinders is partially filled by a block 11, having elastic buffers 12 at its ends, leaving a chamber of partial annular shape. The piston or vane is packed by suitable movable plates 13 upon its sides and ends, which are forced out by springs 14. The inner cylinder is provided with an annular slot through which the lug upon the disk 5 extends, a packing-ring 15 being provided for this slot. Both cylinders are divided transversely and made in two parts, which aroseicured together by bolts passing through an upper bridge-plate 16 and suitable flanges 17 1 on the base-plate. One half of the outer cylinder is preferably provided with a flange 17, {secured to the other half. Depending from each end of the base are hangers 18 18, within which are pivoted the trunnions 19 of the blades or scoops 20. These curved scoops are located eccentrically to their trunnions, the base portion being preferably concentric with the trunnion, so as to enlarge the capacity of the excavator. The end of each scoop is provided with teeth 2i, as shown in Fig. -5, which teeth are arranged to intermesh loosely as the buckets approach each other upon their inward motion. It will be noticed that after the buckets start from the position shown in Fig. 1 their edges move inwardly and away from the portion of ground engaged by the buckets,

so that the friction of the buckets as they move through the ground is greatly decreased, the only friction being that upon the cutting edge itself, as the outer surface of the bucket does not move in contact with the ground during the scooping action.

The scoops are closed at their ends by plates 22 and are actuated by ropes or chains 23, extending between pulleys 24 upon their trunnions and pulleys 25 upon the shaft 4. One of these ropes is crossed, so that upon rotation of the shaft the scoops will be moved toward or from each other. This oscillatory movement of the shaft is accomplished by admitting motive fluid alternately to opposite ends of the chamber 8 through ports 26 thus moving the piston through an arc-shaped path and rocking the shaft.

The operation of the device is apparent. It having been lowered, so that the hangers 18 rest upon the ground, steam-or compressed the eccentric position of the buckets and their peculiar movement toward and. from each other, by which alarge amount of friction and drag of former scoops are avoided, and, further, from the use of the oscillatory shaft and also the rotary motor,which does away with the vertical cylinder ordinarily employed upon excavators used for this purpose. Where the excavator is used upon soft ground free from rocks, the teeth may be removed, the edges of the scoops moving past each other slightly.

Many variations may be made in the form of the buckets, the motor, and their connec tions without departing from my invention, since I claim 1. In an excavator, a pair of swinging buckets, and mechanism arranged to swing the ends of the buckets inwardly and upwardly past each other; substantially as described.

2. In an excavator, apair of opposite swinging buckets eccentrically mounted so that when swung inwardly their ends rise toward each other, and a rotary motor connected to and arranged to actuate said buckets; substantially as described.

3. In an excavator, a pair of oppositely-rotating scoops eccentrically mounted, so that when open they are turned upside down, and mechanism arranged to swing the scoops onehalf a revolution, whereby each scoop picks her in which the piston oscillates; snbstantially as described.

6. In an excavator, a rotary shaft, a hollow cylinder surrounding the same and containing an arc-shaped chamber, an oscillatory piston within the chamber and connected to the shaft, and bu ffers for the piston at the end of its stroke; substantially as described.

In testimony whereof I have hereunto set my hand.

ISAAC P. LAMBING. Witnesses:

O. BYRNEs, G. I'. HoLDsHIP. 

